Just got up to AR20 last night. Not sure if I should progress the story line further or explore the south areas more (collecting those Geo thingies). I'm thinking I'll go do the latter. After getting my son to do a set of 10 wishes, he got me Fischl and Xiangling and I have since been using their "E" combo to get through the game. Barbara continues to be my healer and Noelle as my back-up AOE damage dealer. No 5-star characters yet.